# Search for tools in your AgentCore gateway with a natural language query
If you enabled semantic search for your gateway when you created it, you can call the `x_amz_bedrock_agentcore_search` tool to search for tools in your gateway with a natural language query. Semantic search is particularly useful when you have many tools and need to find the most appropriate ones for your use case. To learn how to enable semantic search during gateway creation, see [Create an Amazon Bedrock AgentCore gateway](gateway-create.md).
## Supported AWS Regions for semantic search
Semantic search is supported in the following AWS Regions:
| Region name | Region |
| --- | --- |
| US East (N. Virginia) | us-east-1 |
| US East (Ohio) | us-east-2 |
| US West (Oregon) | us-west-2 |
| Asia Pacific (Hyderabad) | ap-south-2 |
| Asia Pacific (Mumbai) | ap-south-1 |
| Asia Pacific (Seoul) | ap-northeast-2 |
| Asia Pacific (Singapore) | ap-southeast-1 |
| Asia Pacific (Sydney) | ap-southeast-2 |
| Asia Pacific (Tokyo) | ap-northeast-1 |
| Canada (Central) | ca-central-1 |
| Europe (Frankfurt) | eu-central-1 |
| Europe (Ireland) | eu-west-1 |
| Europe (London) | eu-west-2 |
| Europe (Milan) | eu-south-1 |
| Europe (Paris) | eu-west-3 |
| Europe (Spain) | eu-south-2 |
| Europe (Stockholm) | eu-north-1 |
| South America (São Paulo) | sa-east-1 |
To search for a tool using this AgentCore tool, make the following POST request with the `tools/call` method to the gateway’s MCP endpoint:
**Example**
```
POST /mcp HTTP/1.1
Host: ${GatewayEndpoint}
Accept: application/json, text/event-stream
Content-Type: application/json
Authorization: ${Authorization header}
MCP-Protocol-Version: ${McpProtocolVersion}
{
"jsonrpc": "2.0",
"id": "${RequestName}",
"method": "tools/call",
"params": {
"name": "x_amz_bedrock_agentcore_search",
"arguments": {
"query": ${Query}
}
}
}
```
On version `2026-07-28`, each request carries the `MCP-Protocol-Version` header, the `Mcp-Method` and `Mcp-Name` request-metadata headers, and the `_meta` version fields in the body.
```
POST /mcp HTTP/1.1
Host: ${GatewayEndpoint}
Accept: application/json, text/event-stream
Content-Type: application/json
Authorization: ${Authorization header}
MCP-Protocol-Version: 2026-07-28
Mcp-Method: tools/call
Mcp-Name: x_amz_bedrock_agentcore_search
{
"jsonrpc": "2.0",
"id": "${RequestName}",
"method": "tools/call",
"params": {
"name": "x_amz_bedrock_agentcore_search",
"arguments": {
"query": ${Query}
},
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2026-07-28",
"io.modelcontextprotocol/clientInfo": {
"name": "my-agent",
"version": "1.0.0"
},
"io.modelcontextprotocol/clientCapabilities": {}
}
}
}
```
**Note**
The gateway accepts only the MCP protocol versions listed in the `supportedVersions` field of its `protocolConfiguration.mcp` configuration. To use version `2026-07-28`, make sure that your gateway’s `supportedVersions` includes it. You can change the supported versions with the [UpdateGateway](https://docs.aws.amazon.com/bedrock-agentcore-control/latest/APIReference/API_UpdateGateway.html) API.
Replace the following values:
+ `${GatewayEndpoint}` – The URL of the gateway, as provided in the response of the [CreateGateway](https://docs.aws.amazon.com/bedrock-agentcore-control/latest/APIReference/API_CreateGateway.html) API.
+ `${Authorization header}` – The authorization credentials from the identity provider when you set up [inbound authorization](gateway-inbound-auth.md).
+ `${McpProtocolVersion}` – The MCP protocol version for the request, such as `2025-11-25`. The version must be one that your gateway supports.
+ `${RequestName}` – A name for the request.
+ `${Query}` – A natural language query to search for tools.
The response returns a list of tools that are relevant to the query.
## Code samples for tool searching
To see examples of using natural language queries to find tools in the gateway, select one of the following methods:
**Example**
Set the `MCP-Protocol-Version` header to a version that your gateway supports.
```
import requests
import json
def search_tools(gateway_url, access_token, query):
headers = {
"Content-Type": "application/json",
"Authorization": f"Bearer {access_token}",
"MCP-Protocol-Version": "2025-11-25"
}
payload = {
"jsonrpc": "2.0",
"id": "search-tools-request",
"method": "tools/call",
"params": {
"name": "x_amz_bedrock_agentcore_search",
"arguments": {
"query": query
}
}
}
response = requests.post(gateway_url, headers=headers, json=payload)
return response.json()
# Example usage
gateway_url = "https://${GatewayEndpoint}/mcp" # Replace with your actual gateway endpoint
access_token = "${AccessToken}" # Replace with your actual access token
results = search_tools(gateway_url, access_token, "find order information")
print(json.dumps(results, indent=2))
```
On version `2026-07-28`, include the `Mcp-Method` and `Mcp-Name` request-metadata headers and the `_meta` version fields in the body. The `MCP-Protocol-Version` header must match `_meta.io.modelcontextprotocol/protocolVersion`. Your gateway’s `supportedVersions` must include `2026-07-28`.
```
import requests
import json
def search_tools(gateway_url, access_token, query):
headers = {
"Content-Type": "application/json",
"Authorization": f"Bearer {access_token}",
"MCP-Protocol-Version": "2026-07-28",
"Mcp-Method": "tools/call",
"Mcp-Name": "x_amz_bedrock_agentcore_search"
}
payload = {
"jsonrpc": "2.0",
"id": "search-tools-request",
"method": "tools/call",
"params": {
"name": "x_amz_bedrock_agentcore_search",
"arguments": {
"query": query
},
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2026-07-28",
"io.modelcontextprotocol/clientInfo": {"name": "my-agent", "version": "1.0.0"},
"io.modelcontextprotocol/clientCapabilities": {}
}
}
}
response = requests.post(gateway_url, headers=headers, json=payload)
return response.json()
# Example usage
gateway_url = "https://${GatewayEndpoint}/mcp" # Replace with your actual gateway endpoint
access_token = "${AccessToken}" # Replace with your actual access token
results = search_tools(gateway_url, access_token, "find order information")
print(json.dumps(results, indent=2))
```
```
from mcp import ClientSession
from mcp.client.streamable_http import streamablehttp_client
import asyncio
async def execute_mcp(
url,
token,
tool_params,
headers=None
):
default_headers = {
"Authorization": f"Bearer {token}"
}
headers = {**default_headers, **(headers or {})}
async with streamablehttp_client(
url=url,
headers=headers,
) as (
read_stream,
write_stream,
callA,
):
async with ClientSession(read_stream, write_stream) as session:
# 1. Perform initialization handshake
print("Initializing MCP...")
_init_response = await session.initialize()
print(f"MCP Server Initialize successful! - {_init_response}")
# 2. Call specific tool
print(f"Calling tool: {tool_params['name']}")
tool_response = await session.call_tool(
name=tool_params['name'],
arguments=tool_params['arguments']
)
print(f"Tool response: {tool_response}")
return tool_response
async def main():
url = "https://${GatewayEndpoint}/mcp"
token = "your_bearer_token_here"
tool_params = {
"name": "x_amz_bedrock_agentcore_search",
"arguments": {
"query": "How do I find order details?"
}
}
await execute_mcp(
url=url,
token=token,
tool_params=tool_params
)
if __name__ == "__main__":
asyncio.run(main())
```
```
from strands.tools.mcp.mcp_client import MCPClient
from mcp.client.streamable_http import streamablehttp_client
def create_streamable_http_transport(mcp_url: str, access_token: str):
return streamablehttp_client(mcp_url, headers={"Authorization": f"Bearer {access_token}"})
def get_full_tools_list(client):
"""
List tools w/ support for pagination
"""
more_tools = True
tools = []
pagination_token = None
while more_tools:
tmp_tools = client.list_tools_sync(pagination_token=pagination_token)
tools.extend(tmp_tools)
if tmp_tools.pagination_token is None:
more_tools = False
else:
more_tools = True
pagination_token = tmp_tools.pagination_token
return tools
def run_agent(mcp_url: str, access_token: str):
mcp_client = MCPClient(lambda: create_streamable_http_transport(mcp_url, access_token))
with mcp_client:
tools = get_full_tools_list(mcp_client)
print(f"Found the following tools: {[tool.tool_name for tool in tools]}")
result = mcp_client.call_tool_sync(
tool_use_id="tool-123", # A unique ID for the tool call
name="x_amz_bedrock_agentcore_search", # The name of the tool to invoke
arguments={"query": "find order information"} # A dictionary of arguments for the tool
)
print(result)
url = {gatewayUrl}
token = {AccessToken}
run_agent(url, token)
```
```
import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
url = ""
headers = {}
def filter_search_tool(
):
mcp_client = MultiServerMCPClient(
{
"agent": {
"transport": "streamable_http",
"url": url,
"headers": headers,
}
}
)
tools = asyncio.run(mcp_client.get_tools())
builtin_search_tool = []
for tool in tools:
if tool.name == "x_amz_bedrock_agentcore_search":
builtin_search_tool.append(tool)
return builtin_search_tool
def execute_agent(
user_prompt,
model_id,
region,
tools
):
model = ChatBedrock(model_id=model_id, region_name=region)
agent = create_react_agent(model, filter_search_tool())
_response = asyncio.run(agent.ainvoke({
"messages": user_prompt
}))
_response = _response.get('messages', {})[1].content
print(
f"Invoke Langchain Agents Response"
f"Response - \n{_response}\n"
)
return _response
```